Ever since his first appearance to promote the first Iron-Man movie in 2007, Robert Downey Jr. has been the king of the San Diego Comic Con. Wherever he goes he just lights up a room or in this case, the whole convention floor. He made a surprise visit during a kid’s costume contest held in front of the Iron-Man 3 armor display. He interacted with the kids, helped judge the contest, and posed for a lot of pictures.